The fossil remains of the first flying
vertebrates, the pterosaurs. have intrigued paleontologists for more than two
centuries, How such large creatures, which weighed in some eases as much as a
piloted hang-glider and had wingspans from 8 to 12 meters, solved the problems
of powered flight, and exactly what these creatures were — reptiles or birds —
are among the questions scientists have puzzled over. Perhaps the least controversial assertion about the pterosaurs is that they were reptiles. Their skulls, pelvises, and hind feet are reptilian. The anatomy of their wings suggests that they did not evolve into the class of birds. In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing like membrane. The other fingers were short and reptilian, with sharp claws. In birds the second finger is the prin A. They were unable to fold their wings when not in use. B. They hung upside down from branches as bats do before flight C. They flew in order to capture prey. D. They were an early stage in the evolution of the birds. [填空题]下面是关于王先生个人情况的三对句子。每对句子中,第一句是原句,第二句是对第一句的改写。要求根据原句和第二句中已经给出的部分补全第二句。注意不能改变原句的意思。
Mr.Wang left home earlier in order to catch the bus. Mr.Wang left home earlier so as ______ the bus. [多项选择]某工程包含两个单项工程,分别发包给甲、乙两个承包商。在施工中发生如下事件。
事件一:该工程签约时的计算工程价款为1 000万元,该工程固定要素的系数为0.2;在结算时,各参加调值的品种,除钢材的价格指数增长了10%外均未发生变化,钢材费用占调值部分的50%。 事件二:混凝土工程当年六月开始施工,当地气象资料显示每年七月份为雨期,在此期间承包商由于采取防雨排水措施而增加费用1.5万元;另由于业主原因致使工程在八月份暂停一个月。承包商拟提出索赔。 事件三:工程竣工后,发包人在收到甲递交的竣工结算报告及资料后2个月还没支付结算价款;发包人认可竣工验收报告已经1个月,但乙一直未提交完整的竣工结算报告及资料。 常见的索赔证据主要有( )。 A. 工程各项会议纪要 B. 发包人或工程师签认的签证 C. 投标前发包人提供的参考资料和现场资料 D. 工程核算资料,财务报告等 E. 质量检验书 [判断题]钢轨的存放必须平整、稳固,不得使钢轨产生硬弯。
A.正确 B.错误 [单项选择]全天空,人用肉眼可以看见的星星大约有()颗。
A. 1900多 B. 3000多 C. 6900多 [单选题]《国家电网公司安全工作规定》第一百零八条规定:生产经营单位主要领导、分管领导因安全事故受到撤职处分的,自受处分之日起,( )不得担任任何生产经营单位的主要领导。
A.一年内 B.两年内 C.三年内 D.五年内 [单选题]在一填料塔中用净油来吸收混合气体中的苯,已知混合气体的总量为1000m³/h,其中苯的体积分率为4%,操作压强为101.3kPa温度为293K,吸收剂的用量为103 kmol/h,要求吸收率为80%,塔度底苯溶液的浓度为( )kmol/kmol。
A.0.01 B.0.013 C.0.02 D.0.026 [单选题]具有竞争性拮抗醛固酮作用的利尿药是( )
A.氨苯蝶啶 B.阿米洛利 C.螺内酯 D.氢氯噻嗪 E.乙酰唑胺 [判断题]在技术状态不良的桥梁上及在线路水平严重不良地段,可以进行动力稳定作业。
A.正确 B.错误 [单选题]储存轻质油品的内浮顶储罐,在火场高温作用下罐内油品发生膨胀,并蒸发出大量可燃气体,当内部压力超过罐的耐压强度时,储罐发生( )。
A.物理爆炸 B.化学爆炸 C.爆炸着火 D.爆燃 [单项选择]进行设备验电、()等工作应戴绝缘手套。
A. 安装防盗螺母 B. 涂喷防锈油漆 C. 装拆接地线 D. 安装杆号牌 [多选题]()应取得相应调度机构的调度受令资格。
A.厂站值班员 B.一级间接许可人 C.二级间接许可人 D.厂站负责人 [单项选择]Questions 9 and 10 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions.
Now listen to the news.What are the scientists at the University of California doing to help patients blink A. They are transplanting a piece of muscle from the leg to the eye. B. They are doing surgeries on the eye to help patients blink. C. They are doing tests of a new blink system on real patients. D. They are developing artificial muscles to help patients blink. [单选题]早期新文化运动的性质是( )的思想文化运动。 ( )
A.资产阶级民主主义 B.新民主主义 C.无产阶级 D.马克思主义 [单选题]下列关于重要空白凭保管的说法错误的是( )
A.非营业时间,营业机构存放重要空白凭证,应采取一定的安全防卫措施 B.无人值守的营业机构,不得留存重要空白凭证。 C.营业期间,临时离柜时重要空白凭证应整理后整齐放置于办公桌上,不得随意摆放放置。 D.人员少的营业机构,凭证管理员可由普通柜员兼任。 [单项选择]下列语句中正确的是( )。
[判断题]领导机关下队时应轻车简从,不搞层层陪同,不搞特殊化
A.正确 B.错误 [多选题]《变电系统故障现场处置方案》中规定在设备故障抢修过程中( )应及时互相沟通并且随时向上级领导报告。
A.工程师 B.工班长 C.环控调度 D.行车调度 [单选题]幼儿便后清洁的主要问题不包括( )(1分)
A.便后不会自己擦拭肛门 B.便后不冲水 C.便后不洗手 D.不会自己如厕 E.便后不会清洁肛周 我来回答: 提交
|